md: add mddev->pers to avoid potential NULL pointer dereference

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When doing re-add, we need to ensure rdev->mddev->pers is not NULL,
which can avoid potential NULL pointer derefence in fallowing
add_bound_rdev().

Fixes: a6da4ef85c ("md: re-add a failed disk")
Cc: Xiao Ni <xni@redhat.com>
Cc: NeilBrown <neilb@suse.com>
Cc: <stable@vger.kernel.org> # 4.4+
Reviewed-by: NeilBrown <neilb@suse.com>
Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Song Liu <songliubraving@fb.com>

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Yufen Yu 2019-04-02 14:22:14 +08:00 • committed by Song Liu

parent 0d413829bd

commit ee37e62191

1 changed files with 4 additions and 2 deletions

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drivers/md/md.c

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